TEST CALCULATIONS OF HYDRODYNAMICS OF DISTRIBUTION HEADER SYSTEMS IN NPP HEAT EXCHANGERS AND REACTORS

The paper presents the results of test calculations of hydrodynamics for distribution header systems (DHS) in heat exchangers and reactors of nuclear power plants (NPP). The header system is a typical element of the flow path in the specified NPP equipment, their efficient and safe operation is a priority area for Rosatom State Corporation. The calculations have been performed with the use of computational fluid dynamics software systems known as CFD codes. The results of calculations are presented for the coolant turbulent flow in the flow paths of the flat and cylindrical DHS with different conditions for the coolant supply and removal. A comparative analysis of the calculation results and experimental data on hydrodynamics of DHS typical of the nuclear power plants has been carried out, their satisfactory agreement has been shown. An assumption is made of the legitimacy of using the CFD code for the calculation of hydrodynamics of various DHS types and their specific typical elements.